public class Test {
    public static void main(String[] args) {
        Mystack mystack=new Mystack();
        mystack.push(1);
        mystack.push(2);
        mystack.push(3);
        mystack.push(4);
        mystack.push(5);

        int ret=mystack.peek();
        System.out.println(ret);
        mystack.pop();
        int ret2=mystack.peek();
        System.out.println(ret2);
        int[] elem=new int[5]{1,2,34,5,4};
    }
}
